Coating Compositions

ABSTRACT

Disclosed herein is a composition comprising: an epoxy-containing component, elastomeric particles in an amount of greater than 11% by weight to 25% by weight based on total weight of the composition; and a curing component activatable by an external energy source, the curing component comprising at least one guanidine having a D90 particle size of 25 μm measured by dynamic light scattering. Also disclosed is the composition in an at least partially cured state. Also disclosed is a method for treating a substrate comprising applying the composition to a surface of a substrate; and applying an external energy source to cure the composition. Also disclosed are substrates comprising the composition. Also disclosed are substrates formed by the method of the present invention.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to U.S. Provisional Patent ApplicationSer. No. 62/628,540, filed Feb. 9, 2018 and entitled “AdhesiveComposition” and U.S. Provisional Patent Application Ser. No.62/630,473, filed Feb. 14, 2018 and entitled “Adhesive Composition”,both of which are incorporated in their entirety herein by reference.

GOVERNMENT CONTRACT

This invention was made with Government support under GovernmentContract No. 13-02-0046 TARDEC Fastener/Lightweight awarded by TARDEC.The United States Government has certain rights in this invention.

FIELD OF THE INVENTION

The present invention relates to compositions, for example sealant,adhesive, and coating compositions, and to sealants, adhesives, andcoatings.

BACKGROUND OF THE INVENTION

Coating compositions, including sealants and adhesives, are utilized ina wide variety of applications to treat a variety of substrates or tobond together two or more substrate materials.

The present invention is directed toward one-component compositions,including adhesive compositions that provide sufficient bond strengthand are easy to apply for use in bonding together substrate materials.

SUMMARY OF THE INVENTION

Disclosed herein is a composition, comprising: an epoxy-containingcomponent; elastomeric particles in an amount of greater than 11% byweight to 25% by weight based on total weight of the composition; and acuring component activatable by an external energy source, the curingcomponent comprising at least one guanidine having a D90 particle sizeof 25 μm measured by dynamic light scattering.

Also disclosed are coatings, sealants, and adhesives formed from thecomposition in an at least partially cured state.

Also disclosed is a coated substrate, wherein at least a portion of asurface of the substrate is at least partially coated with a compositioncomprising an epoxy-containing component, elastomeric particles in anamount of greater than 11% by weight to 25% by weight based on totalweight of the composition, and a curing component activatable by anexternal energy source, the curing component comprising at least oneguanidine having a D90 particle size of 25 μm measured by dynamic lightscattering.

Also disclosed is an article comprising first and second substrates anda composition positioned therebetween and in an at least partially curedstate, wherein the composition comprises an epoxy-containing component,elastomeric particles in an amount of greater than 11% by weight to 25%by weight based on total weight of the composition, and a curingcomponent activatable by an external energy source, the curing componentcomprising at least one guanidine having a D90 particle size of 25 μmmeasured by dynamic light scattering.

Also disclosed is a method for forming a coating on a substrate surfacecomprising applying a composition to at least a portion of the substratesurface, the composition comprising an epoxy-containing component,elastomeric particles in an amount of greater than 11% by weight to 25%by weight based on total weight of the composition, and a curingcomponent activatable by an external energy source, the curing componentcomprising at least one guanidine having a D90 particle size of 25 μmmeasured by dynamic light scattering.

Also disclosed is a method for forming a bond between two substratescomprising: applying a composition comprising an epoxy-containingcomponent, elastomeric particles in an amount of greater than 11% byweight to 25% by weight based on total weight of the composition, and acuring component activatable by an external energy source, the curingcomponent comprising at least one guanidine having a D90 particle sizeof 25 μm measured by dynamic light scattering, such that the compositionis located between the first and the second substrate; and applying anexternal energy source to cure the composition.

Also disclosed are substrates formed by the methods of the presentinvention.

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 is a graph illustrating shear stress versus shear strain curvesfor compositions I through VIII (Example 1) collected according to ISO11003-2.

DETAILED DESCRIPTION OF THE INVENTION

For purposes of the following detailed description, it is to beunderstood that the invention may assume various alternative variationsand step sequences, except where expressly specified to the contrary.Moreover, other than in any operating examples, or where otherwiseindicated, all numbers such as those expressing values, amounts,percentages, ranges, subranges and fractions may be read as if prefacedby the word “about,” even if the term does not expressly appear.Accordingly, unless indicated to the contrary, the numerical parametersset forth in the following specification and attached claims areapproximations that may vary depending upon the desired properties to beobtained by the present invention. At the very least, and not as anattempt to limit the application of the doctrine of equivalents to thescope of the claims, each numerical parameter should at least beconstrued in light of the number of reported significant digits and byapplying ordinary rounding techniques. Where a closed or open-endednumerical range is described herein, all numbers, values, amounts,percentages, subranges and fractions within or encompassed by thenumerical range are to be considered as being specifically included inand belonging to the original disclosure of this application as if thesenumbers, values, amounts, percentages, subranges and fractions had beenexplicitly written out in their entirety.

Notwithstanding that the numerical ranges and parameters setting forththe broad scope of the invention are approximations, the numericalvalues set forth in the specific examples are reported as precisely aspossible. Any numerical value, however, inherently contains certainerrors necessarily resulting from the standard variation found in theirrespective testing measurements.

As used herein, unless indicated otherwise, a plural term can encompassits singular counterpart and vice versa, unless indicated otherwise. Forexample, although reference is made herein to “an” epoxy and “a” curingagent, a combination (i.e., a plurality) of these components can beused.

In addition, in this application, the use of “or” means “and/or” unlessspecifically stated otherwise, even though “and/or” may be explicitlyused in certain instances.

As used herein, “including,” “containing” and like terms are understoodin the context of this application to be synonymous with “comprising”and are therefore open-ended and do not exclude the presence ofadditional undescribed or unrecited elements, materials, ingredients ormethod steps. As used herein, “consisting of” is understood in thecontext of this application to exclude the presence of any unspecifiedelement, ingredient or method step. As used herein, “consistingessentially of” is understood in the context of this application toinclude the specified elements, materials, ingredients or method steps“and those that do not materially affect the basic and novelcharacteristic(s)” of what is being described.

As used herein, the terms “on,” “onto,” “applied on,” “applied onto,”“formed on,” “deposited on,” “deposited onto,” mean formed, overlaid,deposited, or provided on but not necessarily in contact with thesurface. For example, a coating composition “applied onto” a substratedoes not preclude the presence of one or more other intervening coatinglayers of the same or different composition located between the coatingcomposition and the substrate.

As used herein, a “coating composition” refers to a composition, e.g., asolution, mixture, or a dispersion, that, in an at least partially driedor cured state, is capable of producing a film, layer, or the like on atleast a portion of a substrate surface.

As used herein, a “sealant composition” refers to a coating composition,e.g., a solution, mixture, or a dispersion, that, in an at leastpartially dried or cured state, has the ability to resist atmosphericconditions and particulate matter, such as moisture and temperature andat least partially block the transmission of materials, such asparticulates, water, fuel, or other liquids and gasses.

As used herein, the term “structural adhesive” means an adhesiveproducing a load-bearing joint having both a lap shear strength ofgreater than 30.0 MPa, measured according to ASTM D1002-10 using 2024-T3aluminum substrate of 1.6 mm thickness, as measured by an INSTRON 5567machine in tensile mode with a pull rate of 1.3 mm per minute, and a lapshear displacement at failure of at least 15% of the overlap length. Asdefined herein, a “1K” or “one-component” coating composition, is acomposition in which all of the ingredients may be premixed and storedand wherein the reactive components do not readily react at ambient orslightly thermal conditions, but instead only react upon activation byan external energy source. In the absence of activation from theexternal energy source, the composition will remain largely unreacted(maintaining sufficient workability in the uncured state and greaterthan 70% of the initial lap shear strength of the composition in thecured state after storage at 25° C. for 8 months). External energysources that may be used to promote the curing reaction (i.e., thecrosslinking of the epoxy component and the curing agent) include, forexample, radiation (i.e., actinic radiation) and/or heat.

As further defined herein, ambient conditions generally refer to roomtemperature and humidity conditions or temperature and humidityconditions that are typically found in the area in which the adhesive isbeing applied to a substrate, e.g., at 10° C. to 40° C. and 5% to 80%relative humidity, while slightly thermal conditions are temperaturesthat are slightly above ambient temperature but are generally below thecuring temperature for the coating composition (i.e. in other words, attemperatures and humidity conditions below which the reactive componentswill readily react and cure, e.g., >40° C. and less than 100° C. at 5%to 80% relative humidity).

As used herein, “Mw” refers to the weight average molecular weight andmeans the theoretical value as determined by Gel PermeationChromatography using Waters 2695 separation module with a Waters 410differential refractometer (RI detector) and polystyrene standards.Tetrahydrofuran (THF) used as the eluent at a flow rate of 1 ml and twoPL Gel Mixed C columns used for separation.

As used herein, the term “catalyst” means a substance that increases therate or decreases the activation energy of a chemical reaction withoutitself undergoing any permanent chemical change.

As used herein, the term “latent curing agent” or “blocked curing agent”or “encapsulated curing agent” means a molecule or a compound that isactivated by an external energy source prior to reacting or having acatalytic effect. For example, the latent curing agent may be in theform of a solid at room temperature and have no catalytic effect untilit is heated and melts, or the latent curing agent may be reversiblyreacted with a second compound that prevents any catalytic effect untilthe reversible reaction is reversed by the application of heat and thesecond compound is removed, freeing the curing agent to react orcatalyze reactions.

As used herein, the term “second curing agent” means a curing agent orcatalyst in the coating composition in addition to the curing componentthat comprises the at least one guanidine described herein.

As used herein, the term “cure”, “cured” or similar terms, as used inconnection with the composition described herein, means that at least aportion of the components that form the composition are crosslinked toform a coating, film, layer, or bond. Additionally, curing of thecomposition refers to subjecting said composition to curing conditions(e.g., elevated temperature) leading to the reaction of the reactivefunctional groups of the components of the composition, and resulting inthe crosslinking of the components of the composition and formation ofan at least partially cured coating. As used herein, the term “at leastpartially cured” with respect to a coating refers to a coating formed bysubjecting the composition to curing conditions such that a chemicalreaction of at least a portion of the reactive groups of the componentsof the composition occurs to form a coating, film, layer, or bond. Acoating composition may be considered to be “at least partially cured”if it has a lap shear strength of at least 1 MPa (measured according toASTM D1002-10). The coating composition may also be subjected to curingconditions such that a substantially complete cure is attained andwherein further curing results in no significant further improvement inthe coating properties such as, for example, increased lap shearperformance.

As used herein, unless indicated otherwise, the term “substantiallyfree” means that a particular material is not purposefully added to amixture or composition, respectively, and is only present as an impurityin a trace amount of less than 5% by weight based on a total weight ofthe mixture or composition, respectively. As used herein, unlessindicated otherwise, the term “essentially free” means that a particularmaterial is only present in an amount of less than 2% by weight based ona total weight of the mixture or composition, respectively. As usedherein, unless indicated otherwise, the term “completely free” meansthat a mixture or composition, respectively, does not comprise aparticular material, i.e., the mixture or composition comprises 0% byweight of such material.

The present invention is directed to a composition comprising, orconsisting essentially of, or consisting of, an epoxy-containingcomponent, elastomeric particles in an amount of greater than 11% byweight to 25% by weight based on total weight of the composition; and acuring component activatable by an external energy source, the curingcomponent comprising at least one guanidine having a D90 particle sizeof 25 μm measured by dynamic light scattering. As used herein, the term“D90” means the point in the size distribution in which 80 percent ormore of the total volume of material in the sample is contained. Forexample, a D90 of 25 μm means that 90% of the particles of the samplehave a size of 25 μm or smaller. The composition may be a coatingcomposition, such as a sealant composition or an adhesive compositionwhich, in an at least partially cured state, may form a coating, such asan adhesive or a sealant.

Also disclosed is a method for forming a coating on a substrate surfacecomprising, or consisting essentially of, or consisting of, applying acomposition to at least a portion of the substrate surface. Thecomposition may comprise, or consist essentially of, or consist of, anepoxy-containing component, elastomeric particles in an amount ofgreater than 11% by weight to 25% by weight based on total weight of thecomposition, and a curing component activatable by an external energysource, the curing component comprising at least one guanidine having aD90 particle size of 25 μm measured by dynamic light scattering.

Also disclosed is a method for forming a bond between two substratescomprising, or consisting essentially of, or consisting of, applying acomposition to at least a portion of a surface of the first substrate,such that the composition is located between the first and the secondsubstrate; and applying an external energy source to cure thecomposition. The composition may comprise, or consist essentially of, orconsist of, an epoxy-containing component, elastomeric particles in anamount of greater than 11% by weight to 25% by weight based on totalweight of the composition, and a curing component activatable by anexternal energy source, the curing component comprising at least oneguanidine having a D90 particle size of 25 μm measured by dynamic lightscattering.

Also disclosed are substrates and articles comprising, or consistingessentially of, or consisting of, coatings formed from the compositionsof the present invention. For example, also disclosed is a coatedsubstrate, wherein at least a portion of a surface of the substrate isat least partially coated with a composition comprising, or consistingessentially of, or consisting of, an epoxy-containing component,elastomeric particles in an amount of greater than 11% by weight to 25%by weight based on total weight of the composition, and a curingcomponent activatable by an external energy source, the curing componentcomprising at least one guanidine having a D90 particle size of 25 μmmeasured by dynamic light scattering. Also disclosed is an articlecomprising, or consisting essentially of, or consisting of, first andsecond substrates and a composition positioned therebetween and in an atleast partially cured state, wherein the composition comprises, orconsists essentially of, or consists of, an epoxy-containing component,elastomeric particles in an amount of greater than 11% by weight to 25%by weight based on total weight of the composition, and a curingcomponent activatable by an external energy source, the curing componentcomprising at least one guanidine having a D90 particle size of 25 μmmeasured by dynamic light scattering.

The coating composition may comprise an epoxy compound. Suitable epoxycompounds that may be used include monoepoxides, polyepoxides, orcombinations thereof.

Suitable monoepoxides that may be used include monoglycidyl ethers ofalcohols and phenols, such as phenyl glycidyl ether, n-butyl glycidylether, cresyl glycidyl ether, isopropyl glycidyl ether, glycidylversatate, for example, CARDURA E available from Shell Chemical Co., andglycidyl esters of monocarboxylic acids such as glycidyl neodecanoate,and mixtures of any of the foregoing.

Useful epoxy-containing components that can be used include polyepoxides(having an epoxy functionality greater than 1), epoxy adducts, orcombinations thereof. Suitable polyepoxides include polyglycidyl ethersof Bisphenol A, such as Epon® 828 and 1001 epoxy resins, and Bisphenol Fpolyepoxides, such as Epon® 862, which are commercially available fromHexion Specialty Chemicals, Inc. Other useful polyepoxides includepolyglycidyl ethers of polyhydric alcohols, polyglycidyl esters ofpolycarboxylic acids, polyepoxides that are derived from the epoxidationof an olefinically unsaturated alicyclic compound, polyepoxidescontaining oxyalkylene groups in the epoxy molecule, and epoxy novolacresins. Still other non-limiting epoxy compounds include epoxidizedBisphenol A novolacs, epoxidized phenolic novolacs, epoxidized cresylicnovolac, isosorbide diglycidyl ether, triglycidyl p-aminophenol, andtriglycidyl p-aminophenol bismaleimide, triglycidyl isocyanurate,tetraglycidyl 4,4′-diaminodiphenylmethane, and tetraglycidyl4,4′-diaminodiphenylsulphone. The epoxy-containing compound may alsocomprise an epoxy-dimer acid adduct. The epoxy-dimer acid adduct may beformed as the reaction product of reactants comprising a diepoxidecompound (such as a polyglycidyl ether of Bisphenol A) and a dimer acid(such as a C36 dimer acid). The epoxy-containing compound may alsocomprise a carboxyl-terminated butadiene-acrylonitrile copolymermodified epoxy-containing compound. The epoxy-containing compound mayalso comprise epoxidized castor oil. The epoxy-containing compound mayalso comprise an epoxy-containing acrylic, such as glycidylmethacrylate.

The epoxy-containing compound may comprise an epoxy-adduct. Thecomposition may comprise one or more epoxy-adducts. As used herein, theterm “epoxy-adduct” refers to a reaction product comprising the residueof an epoxy compound and at least one other compound that does notinclude an epoxide functional group. For example, the epoxy-adduct maycomprise the reaction product of reactants comprising: (1) an epoxycompound, a polyol, and an anhydride; (2) an epoxy compound, a polyol,and a diacid; or (3) an epoxy compound, a polyol, an anhydride, and adiacid.

The epoxy compound used to form the epoxy-adduct may comprise any of theepoxy-containing compounds listed above that may be included in thecomposition.

The polyol used to form the epoxy-adduct may include diols, triols,tetraols and higher functional polyols. Combinations of such polyols mayalso be used. The polyols may be based on a polyether chain derived fromethylene glycol, propylene glycol, butylene glycol, hexylene glycol andthe like as well as mixtures thereof. The polyol may also be based on apolyester chain derived from ring opening polymerization of caprolactone(referred to as polycaprolactone-based polyols hereinafter). Suitablepolyols may also include polyether polyols, polyurethane polyols,polyurea polyols, acrylic polyols, polyester polyols, polybutadienepolyols, hydrogenated polybutadiene polyols, polycarbonate polyols,polysiloxane polyols, and combinations thereof. Polyamines correspondingto polyols may also be used, and in this case, amides instead ofcarboxylic esters will be formed with the diacids and anhydrides.

The polyol may comprise a polycaprolactone-based polyol. Thepolycaprolactone-based polyols may comprise diols, triols or tetraolsterminated with primary hydroxyl groups. Commercially availablepolycaprolactone-based polyols include those sold under the trade nameCapa™ from Perstorp Group, such as, for example, Capa 2054, Capa 2077A,Capa 2085, Capa 2205, Capa 3031, Capa 3050, Capa 3091 and Capa 4101.

The polyol may comprise a polytetrahydrofuran-based polyol. Thepolytetrahydrofuran-based polyols may comprise diols, triols or tetraolsterminated with primary hydroxyl groups. Commercially availablepolytetrahydrofuran-based polyols include those sold under the tradename Terathane®, such as Terathane® PTMEG 250 and Terathane® PTMEG 650which are blends of linear diols in which the hydroxyl groups areseparated by repeating tetramethylene ether groups, available fromInvista. In addition, polyols based on dimer diols sold under the tradenames Pripol®, Solvermol™ and Empol®, available from Cognis Corporation,or bio-based polyols, such as the tetrafunctional polyol Agrol 4.0,available from BioBased Technologies, may also be utilized.

The anhydride that may be used to form the epoxy-adduct may comprise anysuitable acid anhydride known in the art. For example, the anhydride maycomprise hexahydrophthalic anhydride and its derivatives (e.g., methylhexahydrophthalic anhydride); phthalic anhydride and its derivatives(e.g., methyl phthalic anhydride); maleic anhydride; succinic anhydride;trimelletic anhydride; pyromelletic dianhydride (PMDA);3,3′,4,4′-oxydiphthalic dianhydride (ODPA); 3,3′,4,4′-benzopheronetetracarboxylic dianhydride (BTDA); and 4,4′-diphthalic(hexafluoroisopropylidene) anhydride (6FDA).

The diacid used to form the epoxy-adduct may comprise any suitablediacid known in the art. For example, the diacids may comprise phthalicacid and its derivates (e.g., methyl phthalic acid), hexahydrophthalicacid and its derivatives (e.g., methyl hexahydrophthalic acid), maleicacid, succinic acid, adipic acid, and the like.

The epoxy-adduct may comprise a diol, a monoanhydride or a diacid, and adiepoxy compound, wherein the mole ratio of diol, monoanhydride (ordiacid), and diepoxy compounds in the epoxy-adduct may vary from0.5:0.8:1.0 to 0.5:1.0:6.0.

The epoxy-adduct may comprise a triol, a monoanhydride or a diacid, anda diepoxy compound, wherein the mole ratio of triol, monoanhydride (ordiacid), and diepoxy compounds in the epoxy-adduct may vary from0.5:0.8:1.0 to 0.5:1.0:6.0.

The epoxy-adduct may comprise a tetraol, a monoanhydride or a diacid,and a diepoxy compound, wherein the mole ratio of tetraol, monoanhydride(or diacid), and diepoxy compounds in the epoxy-adduct may vary from0.5:0.8:1.0 to 0.5:1.0:6.0.

Other suitable epoxy-containing components include epoxy-adducts such asepoxy polyesters formed as the reaction product of reactants comprisingan epoxy-containing compound, a polyol and an anhydride, as described inU.S. Pat. No. 8,796,361, col. 3, line 42 through col. 4, line 65, thecited portion of which is incorporated herein by reference.

The epoxy-containing component may have an average epoxide functionalityof greater than 1.0, such as at least 1.8, and may have an averageepoxide functionality of less than 3.2, such as no more than 2.8. Theepoxy-containing component may have an average epoxide functionality ofgreater than 1.0 to less than 3.2, such as 1.8 to 2.8. As used herein,the term “average epoxide functionality” means the molar ratio ofepoxide functional groups to epoxide-containing molecules in thecomposition.

According to the present invention, the epoxy-containing component maybe present in the composition in an amount of at least 45% by weightbased on the total composition weight, such as at least 55%, and in somecases may be present in the coating composition in an amount of no morethan 90% by weight based on the total composition weight, such as nomore than 85%. According to the present invention, the epoxy-containingcomponent may be present in the coating composition in an amount of from45% to 90% by weight based on the total composition weight, such as from55% to 85%.

According to the present invention, the epoxy equivalent weight of theepoxy-containing component of the coating composition may be at least 40g/eq, such as at least 74 g/eq, such as at least 160 g/eq, such as atleast 200 g/eq, such as at least 500 g/eq, such as at least 1,000 g/eq,and in some cases may be no more than 2,000 g/eq, such as no more than1,000 g/eq, such as no more than 500 g/eq, such as no more than 200g/eq. According to the present invention, the epoxy equivalent weight ofthe epoxy-containing component of the coating composition can range from40 g/eq to 2,000 g/eq, such as from 100 g/eq to 1,000 g/eq, such as from160 g/eq to 500 g/eq. As used herein, the “epoxy equivalent weight” isdetermined by dividing the molecular weight of the epoxy-containingcomponent by the number of epoxy groups present in the epoxy-containingcomponent.

According to the present invention, the molecular weight (Mw) of theepoxy-containing component of the coating composition may be at least 40g/mol, such as at least 74 g/mol, such as at least 198 g/mol, such as atleast 310 g/mol, such as at least 500 g/mol, such as at least 1,000g/mol, and in some cases no more than 20,000 g/mol, such as no more than4,000 g/mol, such as no more than 2,000 g/mol, such as no more than 400g/mol, such as no more than 300 g/mol. According to the presentinvention, the molecular weight of the epoxy-containing component of thecoating composition can range from 40 g/mol to 20,000 g/mol, such asfrom 198 g/mol to 4,000 g/mol, such as from 310 g/mol to 2,000 g/mol,such as from 500 g/mol to 1,000 g/mol.

The coating composition according to the present invention furthercomprises elastomeric particles. As used herein, “elastomeric particles”refers to particles comprised of one or more materials having at leastone glass transition temperature (Tg) of greater than −150° C. and lessthan 30° C., calculated, for example, using the Fox Equation. Theelastomeric particles may be phase-separated from the epoxy-containingcomponent. As used herein, the term “phase-separated” means forming adiscrete domain within a matrix of the epoxy-containing component.

The elastomeric particles may have a core/shell structure. Suitablecore-shell elastomeric particles may be comprised of an acrylic shelland an elastomeric core. The core may comprise natural or syntheticrubbers, polybutadiene, styrene-butadiene, polyisoprene, chloroprene,acrylonitrile butadiene, butyl rubber, polysiloxane, polysulfide,ethylene-vinyl acetate, fluoroelastomer, polyolefin, or combinationsthereof.

According to the present invention, the average particle size of theelastomeric particles may be at least 20 nm, as measured by transmissionelectron microscopy (TEM), such as at least 30 nm, such as at least 40nm, such as at least 50 nm, and may be no more than 400 nm, such as nomore than 300 nm, such as no more than 200 nm, such as no more than 150nm. According to the present invention, the average particle size of theelastomeric particles may be 20 nm to 400 nm as measured by TEM, such as30 nm, to 300 nm, such as 40 nm to 200 nm, such as 50 nm to 150 nm.Suitable methods of measuring particle sizes by TEM include suspendingelastomeric particles in a solvent selected such that the particles donot swell, and then drop casting the suspension onto a TEM grid which isallowed to dry under ambient conditions. For example, epoxy resincontaining core-shell rubber elastomeric particles from Kaneka TexasCorporation can be diluted in butyl acetate for drop casting. Particlesize measurements may be obtained from images acquired using a TecnaiT20 TEM operating at 200 kV and analyzed using ImageJ software, or anequivalent instrument and software.

According to the present invention, the elastomeric particles mayoptionally be included in an epoxy carrier resin for introduction intothe coating composition. Suitable finely dispersed core-shellelastomeric particles in an average particle size ranging from 20 nm to400 nm may be master-batched in epoxy resin such as aromatic epoxides,phenolic novolac epoxy resin, bisphenol A and/or bisphenol F diepoxide,and/or aliphatic epoxides, which include cyclo-aliphatic epoxides, atconcentrations ranging from 1% to 80% core-shell elastomeric particlesby weight based on the total weight of the elastomeric dispersion, suchas from 5% to 50%, such as from 15% to 35%. Suitable epoxy resins mayalso include a mixture of epoxy resins. When utilized, the epoxy carrierresin may be an epoxy-containing component of the present invention suchthat the weight of the epoxy-containing component present in the coatingcomposition includes the weight of the epoxy carrier resin.

Exemplary non-limiting commercial core-shell elastomeric particleproducts using poly(butadiene) rubber particles that may be utilized inthe coating composition of the present invention include core-shellpoly(butadiene) rubber powder (commercially available as PARALOID™ EXL2650A from Dow Chemical), a core-shell poly(butadiene) rubber dispersion(25% core-shell rubber by weight) in bisphenol F diglycidyl ether(commercially available as Kane Ace MX 136), a core-shellpoly(butadiene) rubber dispersion (33% core-shell rubber by weight) inEpon® 828 (commercially available as Kane Ace MX 153), a core-shellpoly(butadiene) rubber dispersion (33% core-shell rubber by weight) inEpiclon® EXA-835LV (commercially available as Kane Ace MX 139), acore-shell poly(butadiene) rubber dispersion (37% core-shell rubber byweight) in bisphenol A diglycidyl ether (commercially available as KaneAce MX 257), and a core-shell poly(butadiene) rubber dispersion (37%core-shell rubber by weight) in Epon® 863 (commercially available asKane Ace MX 267), each available from Kaneka Texas Corporation.

Exemplary non-limiting commercial core-shell elastomeric particleproducts using styrene-butadiene rubber particles that may be utilizedin the coating composition include a core-shell styrene-butadiene rubberpowder (commercially available as CLEARSTRENGTH® XT100 from Arkema),core-shell styrene-butadiene rubber powder (commercially available asPARALOID™ EXL 2650J), a core-shell styrene-butadiene rubber dispersion(33% core-shell rubber by weight) in bisphenol A diglycidyl ether(commercially available as Fortegra™ 352 from Olin™), core-shellstyrene-butadiene rubber dispersion (33% rubber by weight) in lowviscosity bisphenol A diglycidyl ether (commercially available as KaneAce MX 113), a core-shell styrene-butadiene rubber dispersion (25%core-shell rubber by weight) in bisphenol A diglycidyl ether(commercially available as Kane Ace MX 125), a core-shellstyrene-butadiene rubber dispersion (25% core-shell rubber by weight) inbisphenol F diglycidyl ether (commercially available as Kane Ace MX135), a core-shell styrene-butadiene rubber dispersion (25% core-shellrubber by weight) in D.E.N.™-438 phenolic novolac epoxy (commerciallyavailable as Kane Ace MX 215), a core-shell styrene-butadiene rubberdispersion (25% core-shell rubber by weight) in Araldite® MY-721multi-functional epoxy (commercially available as Kane Ace MX 416), acore-shell styrene-butadiene rubber dispersion (25% core-shell rubber byweight) in MY-0510 multi-functional epoxy (commercially available asKane Ace MX 451), a core-shell styrene-butadiene rubber dispersion (25%core-shell rubber by weight) in Syna Epoxy 21 Cyclo-aliphatic Epoxy fromSynasia (commercially available as Kane Ace MX 551), and a core-shellstyrene-butadiene rubber dispersion (25% core-shell rubber by weight) inpolypropylene glycol (MW 400) (commercially available as Kane Ace MX715), each available from Kaneka Texas Corporation.

Exemplary non-limiting commercial core-shell elastomeric particleproducts using polysiloxane rubber particles that may be utilized in thecoating composition of the present invention include a core-shellpolysiloxane rubber powder (commercially available as GENIOPERL® P52from Wacker), a core-shell polysiloxane rubber dispersion (40%core-shell rubber by weight) in bisphenol A diglycidyl ether(commercially available as ALBIDUR® EP2240A from Evonick), a core-shellpolysiloxane rubber dispersion (25% core-shell rubber by weight) injER™828 (commercially available as Kane Ace MX 960), a core-shellpolysiloxane rubber dispersion (25% core-shell rubber by weight) inEpon® 863 (commercially available as Kane Ace MX 965) each availablefrom Kaneka Texas Corporation.

The elastomeric particles may be present in the composition in an amountof greater than 11% by weight based on the total composition weight,such as at least 15%, and in some cases may be present in thecomposition in an amount of no more than 40% by weight based on thetotal composition weight, such as no more than 35%, such as no more than25%. According to the present invention, the elastomeric particles maybe present in the composition in an amount of from greater than 11% to40% by weight based on the total composition weight, such as greaterthan 11% to 25%, such as from 15% to 25%.

According to the present invention, at least 50% by weight of theelastomeric particles comprise a styrene butadiene core based on totalweight of the elastomeric particles in the coating composition. Forexample, elastomeric particles comprising a styrene butadiene core maybe present in the coating composition in an amount of at least 50% byweight based on total weight of the elastomeric particles, such as atleast 65% by weight, such as at least 75% by weight, and may be presentin an amount of 100% by weight based on total weight of elastomericparticles in the coating composition, such as no more 95% by weight,such as no more than 90% by weight. Elastomeric particles comprising astyrene butadiene core may be present in the coating composition in anamount of 50% by weight to 100% by weight based on total weight of theelastomeric particles in the coating composition, such as 65% by weightto 95% by weight, such as 75% by weight to 90% by weight.

According to the present invention, at least 50% by weight of theelastomeric particles have an average particle size (based on TEM asdescribed herein) of no more than 150 nm based on total weight of theelastomeric particles in the coating composition, such as 50 nm to 150nm. For example, elastomeric particles having an average particle size(based on TEM as described herein) of no more than 150 nm, such as 50 nmto 150 nm, may be present in the coating composition in an amount of atleast 50% by weight based on total weight of the elastomeric particles,such as at least 65% by weight, such as at least 75% by weight, and maybe present in an amount of 100% by weight based on total weight ofelastomeric particles in the coating composition, such as no more 95% byweight, such as no more than 90% by weight. Elastomeric particles havingan average particle size of 150 nm (based on TEM as described herein),such as 50 nm to 150 nm, may be present in the coating composition in anamount of 50% by weight to 100% by weight based on total weight of theelastomeric particles in the coating composition, such as 65% by weightto 95% by weight, such as 75% by weight to 90% by weight.

According to the present invention, no more than 50% by weight of theelastomeric particles comprise a polybutadiene core based on totalweight of the elastomeric particles in the coating composition. Forexample, if elastomeric particles containing a polybutadiene core arepresent at all, they may be present in an amount of at least 5% byweight based on total weight of the elastomeric particles, such as atleast 10%, and may be present in an amount of no more than 50% by weightbased on total weight of the elastomeric particles, such as no more than35% by weight, such as no more than 25% by weight. Elastomeric particlescontaining a polybutadiene core may be present in the coatingcomposition of the present invention in an amount of 0% by weight to 50%by weight based on total weight of the elastomeric particles, such as 5%by weight to 35%, such as 10% by weight to 25% by weight.

According to the present invention, no more than 50% by weight of theelastomeric particles comprise a polysiloxane core based on total weightof the elastomeric particles in the coating composition. For example, ifelastomeric particles containing a polysiloxane core are present at all,they may be present in an amount of at least 5% by weight based on totalweight of the elastomeric particles, such as at least 10%, and may bepresent in an amount of no more than 50% by weight based on total weightof the elastomeric particles, such as no more than 35% by weight, suchas no more than 25% by weight. Elastomeric particles comprising apolysiloxane core may be present in the coating composition of thepresent invention in an amount of 0% by weight to 50% by weight based ontotal weight of the elastomeric particles, such as 5% by weight to 35%,such as 10% by weight to 25% by weight.

The composition of the present invention further comprises a curingcomponent activatable by an external energy source, the curing componentcomprising, or consisting essentially of, or consisting of, a guanidine.It will be understood that “guanidine,” as used herein, refers toguanidine and derivatives thereof. For example, the curing componentthat may be used includes guanidines, substituted guanidines,substituted ureas, melamine resins, guanamine derivatives,heat-activated cyclic tertiary amines, aromatic amines and/or mixturesthereof. Examples of substituted guanidines are methylguanidine,dimethylguanidine, trimethylguanidine, tetramethylguanidine,methylisobiguanidine, dimethylisobiguanidine, tetramethylisobiguanidine,hexamethylisobiguanidine, heptamethylisobiguanidine and, moreespecially, cyanoguanidine (dicyandiamide, e.g. Dyhard® available fromAlzChem). Representatives of suitable guanamine derivatives which may bementioned are alkylated benzoguanamine resins, benzoguanamine resins ormethoxymethylethoxymethylbenzoguanamine.

For example, the guanidine may comprise a compound, moiety, and/orresidue having the following general structure:

wherein each of R1, R2, R3, R4, and R5 (i.e., substituents of structure(I)) comprise hydrogen, (cyclo)alkyl, aryl, aromatic, organometallic, apolymeric structure, or together can form a cycloalkyl, aryl, or anaromatic structure, and wherein R1, R2, R3, R4, and R5 may be the sameor different. As used herein, “(cyclo)alkyl” refers to both alkyl andcycloalkyl. When any of the R groups “together can form a (cyclo)alkyl,aryl, and/or aromatic group”, it is meant that any two adjacent R groupsare connected to form a cyclic moiety, such as the rings in structures(II)-(V) below.

It will be appreciated that the double bond between the carbon atom andthe nitrogen atom that is depicted in structure (I) may be locatedbetween the carbon atom and another nitrogen atom of structure (I).Accordingly, the various substituents of structure (I) may be attachedto different nitrogen atoms depending on where the double bond islocated within the structure.

The guanidine may comprise a cyclic guanidine such as a guanidine ofstructure (I) wherein two or more R groups of structure (I) togetherform one or more rings. In other words, the cyclic guanidine maycomprise ≥1 ring(s). For example, the cyclic guanidine may either be amonocyclic guanidine (1 ring) such as depicted in structures (II) and(III) below, or the cyclic guanidine may be bicyclic or polycyclicguanidine (≥2 rings) such as depicted in structures (IV) and (V) below.

Each substituent of structures (II) and/or (III), R1-R7, may comprisehydrogen, (cyclo)alkyl, aryl, aromatic, organometallic, a polymericstructure, or together can form a cycloalkyl, aryl, or an aromaticstructure, and wherein R1-R7 may be the same or different. Similarly,each substituent of structures (IV) and (V), R1-R9, may be hydrogen,alkyl, aryl, aromatic, organometallic, a polymeric structure, ortogether can form a cycloalkyl, aryl, or an aromatic structure, andwherein R1-R9 may be the same or different. Moreover, in some examplesof structures (II) and/or (III), certain combinations of R1-R7 may bepart of the same ring structure. For example, R1 and R7 of structure(II) may form part of a single ring structure. Moreover, it will beunderstood that any combination of substituents (R1-R7 of structures(II) and/or (III) as well as R1-R9 of structures (IV) and/or (V)) may bechosen so long as the substituents do not substantially interfere withthe catalytic activity of the cyclic guanidine.

Each ring in the cyclic guanidine may be comprised of ≥5 members. Forexample, the cyclic guanidine may comprise a 5-member ring, a 6-memberring, and/or a 7-member ring. As used herein, the term “member” refersto an atom located in a ring structure. Accordingly, a 5-member ringwill have 5 atoms in the ring structure (“n” and/or “m”=1 in structures(II)-(V)), a 6-member ring will have 6 atoms in the ring structure (“n”and/or “m”=2 in structures (II)-(V)), and a 7-member ring will have 7atoms in the ring structure (“n” and/or “m”=3 in structures (II)-(V)).It will be appreciated that if the cyclic guanidine is comprised of ≥2rings (e.g., structures (IV) and (V)), the number of members in eachring of the cyclic guanidine can either be the same or different. Forexample, one ring may be a 5-member ring while the other ring may be a6-member ring. If the cyclic guanidine is comprised of ≥3 rings, then inaddition to the combinations cited in the preceding sentence, the numberof members in a first ring of the cyclic guanidine may be different fromthe number of members in any other ring of the cyclic guanidine.

It will also be understood that the nitrogen atoms of structures(II)-(V) may further have additional atoms attached thereto. Moreover,the cyclic guanidine may either be substituted or unsubstituted. Forexample, as used herein in conjunction with the cyclic guanidine, theterm “substituted” refers to a cyclic guanidine wherein R5, R6, and/orR7 of structures (II) and/or (III) and/or R9 of structures (IV) and/or(V) is not hydrogen. As used herein in conjunction with the cyclicguanidine, the term “unsubstituted” refers to a cyclic guanidine whereinR1-R7 of structures (II) and/or (III) and/or R1-R9 of structures (IV)and/or (V) are hydrogen.

The cyclic guanidine may comprise a bicyclic guanidine, and the bicyclicguanidine may comprise 1,5,7-triazabicyclo[4.4.0]dec-5-ene (“TBD” or“BCG”).

The guanidine may be present in the composition in an amount of at least2% by weight based on total weight of the composition, such as at least5% by weight, and may be present in an amount of no more than 20% byweight based on total weight of the composition, such as no more than15%, such as no more than 10%. The guanidine may be present in thecomposition in an amount of 2% by weight to 20% by weight based on totalweight of the composition, such as 5% by weight to 15% by weight, suchas 7% by weight to 12% by weight.

The guanidine particles may have a D90 particle size of 25 μm asmeasured by dynamic light scattering, such as a D90 particle size of 20μm, such as a D90 particle size of 15 μm. Useful instruments useful formeasuring the D90 include a LS 13 320 Laser Diffraction Particle SizeAnalyzer (available from Beckman Coulter) or similar instruments.

According to the present invention, the coating composition optionallymay further comprise a second curing agent. The curing agent may be alatent curing agent, a blocked curing agent, an encapsulated curingagent, or combinations thereof.

Useful second curing agents may comprise amidoamine or polyamidecatalysts, such as, for example, one of the Ancamide® products availablefrom Air Products, amine, dihydrazide, or dicyandiamide adducts andcomplexes, such as, for example, one of the Ajicure® products availablefrom Ajinomoto Fine Techno Company, 3,4-dichlorophenyl-N,N-dimethylurea(A.K.A. Diuron) available from Alz Chem, or combinations thereof.

According to the present invention, when utilized, the second curingagent may be present in the coating composition in an amount of at least0.01% by weight based on the total composition weight, such as at least1%, such as at least 5%, and in some cases may be present in the coatingcomposition in an amount of no more than 10% by weight based on thetotal composition weight, such as no more than 5%, such as no more than1%. According to the present invention, when utilized, the second curingagent may be present in the coating composition in an amount from 0.01%to 10% by weight based on the total composition weight, such as from 1%to 5%.

According to the present invention, reinforcement fillers may optionallybe added to the coating composition. Useful reinforcement fillers thatmay be introduced to the coating composition of the present invention toprovide improved mechanical materials such as fiberglass, fibroustitanium dioxide, whisker type calcium carbonate (aragonite), and carbonfiber (which includes graphite and carbon nanotubes). In addition, fiberglass ground to 5 microns or wider and to 50 microns or longer may alsoprovide additional tensile strength.

According to the present invention, organic and/or inorganic fillers,such as those that are substantially spherical, may optionally be addedto the coating composition. Useful organic fillers that may beintroduced include cellulose, starch, and acrylic. Useful inorganicfillers that may be introduced include borosilicate, aluminosilicate,and calcium carbonate. The organic and inorganic fillers may be solid,hollow, or layered in composition and may range in size from 10 nm to 1mm in at least one dimension.

Optionally, according to the present invention, additional fillers,thixotropes, colorants, tints and/or other materials also may be addedto the coating composition.

Useful thixotropes that may be used include untreated fumed silica andtreated fumed silica, castor wax, clay, organo clay and combinationsthereof. In addition, fibers such as synthetic fibers like Aramid® fiberand Kevlar® fiber, acrylic fibers, and/or engineered cellulose fiber mayalso be utilized.

Useful colorants, dyes, or tints may include red iron pigment, titaniumdioxide, calcium carbonate, and phthalocyanine blue and combinationsthereof.

Useful fillers that may be used in conjunction with thixotropes mayinclude inorganic fillers such as inorganic clay or silica andcombinations thereof.

Exemplary other materials that may be utilized include, for example,calcium oxide and carbon black and combinations thereof.

Such fillers, if present at all, may be present in an amount of no morethan 20% by weight based on total weight of the composition, such as nomore than 10% by weight, such as no more than 5% by weight. Suchfillers, if present at all, may be present in an amount of 0.1% to 20%by weight based on total weight of the composition, such as 1% to 15% byweight, such as 5% to 10% by weight.

Optionally, the composition may be substantially free, or essentiallyfree, or completely free, of platy fillers such as mica, talc,pyrophyllite, chlorite, vermiculite, or combinations thereof.

Optionally, the composition may be substantially free, or essentiallyfree, or completely free, of free radical initiators.

It has been surprisingly discovered that the addition of additives tothe composition in an aggregate amount greater than 20% by weight basedon total composition weight significantly reduce the lap shear strengthand displacement, such as greater than 15% by weight, such as greaterthan 10% by weight. That is, the composition may contain up to 20% byweight additives based on total composition weight, such as up to 15% byweight, such as up to 10% by weight. In examples, the composition may besubstantially free, or essentially free, or completely free, ofadditives. As used herein, the term “additives” refers to ingredients orcomponents included in the coating composition in addition to theepoxy-containing component, the elastomeric particles, the guanidinecuring component, the second curing agent, and the fillers describedherein. Exemplary non-limiting examples of such additives includeflexibilizers such as Flexibilzer® DY 965 from Huntsman Corporation,reactive liquid rubber, non-reactive liquid rubber, epoxy-amine adducts(such as those described above but, when present, different from theepoxy-containing component present in the coating composition),epoxy-thiol adducts, blocked isocyanates, capped isocyanates,epoxy-urethanes, epoxy-ureas, modified epoxies from Hexion, HELOXY™modifiers from Hexion, adhesion promoters, silane coupling agents suchas Silquest A-187 from Momentive, flame retardants, colloidal silicasuch as NANOPDX® dispersions from Evonik, thermoplastic resins, acrylicpolymer beads such as ZEFIAC® beads from AICA Kogyo Co, or combinationsthereof.

The present invention also is directed to a method for treating asubstrate comprising, or consisting essentially of, or consisting of,contacting at least a portion of a surface of the substrate with one ofthe compositions of the present invention described hereinabove. Thecomposition may be cured to form a coating, layer or film on thesubstrate surface by exposure to an external energy source, as describedherein. The coating, layer or film, may be, for example, a sealant or anadhesive.

The present invention is also directed to a method for forming a bondbetween two substrates for a wide variety of potential applications inwhich the bond between the substrates provides particular mechanicalproperties related to both lap shear strength and displacement. Themethod may comprise, or consist essentially of, or consist of, applyingthe composition described above to a first substrate; contacting asecond substrate to the composition such that the composition is locatedbetween the first substrate and the second substrate; and curing thecomposition by exposure to an external energy source, as describedherein. For example, the composition may be applied to either one orboth of the substrate materials being bonded to form an adhesive bondtherebetween and the substrates may be aligned and pressure and/orspacers may be added to control bond thickness. The composition may beapplied to cleaned or uncleaned (i.e., including oily or oiled)substrate surfaces.

As stated above, the composition of the present disclosure also may forma coating, such as a sealant, on a substrate or a substrate surface. Thecoating composition may be applied to substrate surfaces, including, byway of non-limiting example, a vehicle body or components of anautomobile frame or an airplane, or to armor assemblies such as those ona tank, or to protective clothing such as body armor, personal armor,suits of armor, and the like. The sealant formed by the composition ofthe present invention provides sufficient lap shear strength anddisplacement. The composition may be applied to cleaned or uncleaned(i.e., including oily or oiled) substrate surfaces. It may also beapplied to a substrate that has been pretreated, coated with anelectrodepositable coating, coated with additional layers such as aprimer, basecoat, or topcoat. An external energy source may subsequentlybe applied to cure the coating composition, such as baking in an oven.

The composition described above may be applied alone or as part of acoating system that can be deposited in a number of different ways ontoa number of different substrates. The system may comprise a number ofthe same or different layers and may further comprise other coatingcompositions such as pretreatment compositions, primers, and the like. Acoating, film, layer or the like is typically formed when a compositionthat is deposited onto the substrate is at least partially cured bymethods known to those of ordinary skill in the art (e.g., by exposureto thermal heating or actinic radiation).

The composition can be applied to the surface of a substrate in anynumber of different ways, non-limiting examples of which includebrushes, rollers, films, pellets, pressure injectors, spray guns andapplicator guns. Optionally, the substrate may be 100% water break free.Optionally, the substrate may be non-water break free. As used herein,“water break free” means that water spreads evenly over the surface anddoes not bead up. As used herein, “non-water break free” means thatwater beads up over the surface.

After application to the substrate, the composition can be cured to forma coating, layer or film, such as using an external energy source suchas an oven or other thermal means or through the use of actinicradiation. For example, the composition can be cured by baking and/orcuring at elevated temperature, such as at a temperature of at least 80°C., such as at least 100° C., such as at least 120° C., such as at least125° C., such as at least 130° C., and in some cases at a temperature ofno more than 250° C., such as no more than 210° C., such as no more than185° C., such as no more than 170° C., such as no more than 165° C., andin some cases at a temperature of from 80° C. to 250° C., from 120° C.to 185° C., from 125° C. to 170° C., from 130° C. to 165° C., and forany desired time period (e.g., from 5 minutes to 5 hours) sufficient toat least partially cure the coating composition on the substrate(s). Theskilled person understands, however, that the time of curing varies withtemperature. The coating, layer or film, may be, for example, a sealantor an adhesive, as described above.

As stated above, the present disclosure is directed to adhesivecompositions that are used to bond together two substrate materials fora wide variety of potential applications in which the bond between thesubstrate materials provides particular mechanical properties related tocombined lap shear strength and displacement. The adhesive compositionmay be applied to either one or both of the substrate materials beingbonded such as, by way of non-limiting example, components of a vehicle.The pieces are aligned and pressure and/or spacers may be added tocontrol bond thickness.

As stated above, the present disclosure also is directed to coatingcompositions that are used to coat a surface of a substrate to provideparticular mechanical properties including strength and elongation. Thecoating composition may be applied to at least a portion of substratesurface, such as any of the substrates described herein.

It has been surprisingly discovered that the coating composition of thepresent invention provides, in an at least partially cured state, acoating that provides particular mechanical properties, including bothincreased strength and increased strain, displacement or elongation.

It has been surprisingly discovered that the coating compositions of thepresent invention, in the at least partially cured state (i.e., coatingsof the present invention), have a hardness of greater than 100 N/mm² andan elongation of at least 40%.

It has been surprisingly discovered that the coating compositions of thepresent invention, in the at least partially cured state (i.e.,adhesives of the present invention), have both a shear stress of atleast 33.0 MPa and a shear strain of at least 34.5% measured inaccordance with ISO 11003-2.

It also has been surprisingly discovered that the coating compositionsof the present invention, in the at least partially cured state (i.e.,adhesives of the present invention), have both a lap shear strength ofgreater than 30.0 MPa, measured according to ASTM D1002-10 using 2024-T3aluminum substrate of 1.6 mm thickness, as measured by an INSTRON 5567machine in tensile mode with a pull rate of 1.3 mm per minute, and a lapshear displacement at failure of at least 15% of the overlap length.

The substrates that may be coated by the compositions of the presentinvention are not limited. Suitable substrates useful in the presentinvention include, but are not limited to, materials such as metals ormetal alloys, ceramic materials such as boron carbide or siliconcarbide, polymeric materials such as hard plastics including filled andunfilled thermoplastic materials or thermoset materials, or compositematerials. Other suitable substrates useful in the present inventioninclude, but are not limited to, glass or natural materials such aswood. For example, suitable substrates include rigid metal substratessuch as ferrous metals, aluminum, aluminum alloys, magnesium titanium,copper, and other metal and alloy substrates. The ferrous metalsubstrates used in the practice of the present invention may includeiron, steel, and alloys thereof. Non-limiting examples of useful steelmaterials include cold rolled steel, galvanized (zinc coated) steel,electrogalvanized steel, stainless steel, pickled steel, zinc-iron alloysuch as GALVANNEAL, and combinations thereof. Combinations or compositesof ferrous and non-ferrous metals can also be used. Aluminum alloys ofthe 1XXX, 2XXX, 3XXX, 4XXX, 5XXX, 6XXX, 7XXX, or 8XXX series as well asclad aluminum alloys and cast aluminum alloys of the A356, 1XX.X, 2XX.X,3XX.X, 4XX.X, 5XX.X, 6XX.X, 7XX.X, or 8XX.X series also may be used asthe substrate. Magnesium alloys of the AZ31B, AZ91C, AM60B, or EV31Aseries also may be used as the substrate. The substrate used in thepresent invention may also comprise titanium and/or titanium alloys ofgrades 1-36 including H grade variants. Other suitable non-ferrousmetals include copper and magnesium, as well as alloys of thesematerials. Suitable metal substrates for use in the present inventioninclude those that are used in the assembly of vehicular bodies (e.g.,without limitation, door, body panel, trunk deck lid, roof panel, hood,roof and/or stringers, rivets, landing gear components, and/or skinsused on an aircraft), a vehicular frame, vehicular parts, motorcycles,wheels, and industrial structures and components. As used herein,“vehicle” or variations thereof includes, but is not limited to,civilian, commercial and military aircraft, and/or land vehicles such ascars, motorcycles, and/or trucks. The metal substrate also may be in theform of, for example, a sheet of metal or a fabricated part. It willalso be understood that the substrate may be pretreated with apretreatment solution including a zinc phosphate pretreatment solutionsuch as, for example, those described in U.S. Pat. Nos. 4,793,867 and5,588,989, or a zirconium containing pretreatment solution such as, forexample, those described in U.S. Pat. Nos. 7,749,368 and 8,673,091. Thesubstrate may comprise a composite material such as a plastic or afiberglass composite. The substrate may be a fiberglass and/or carbonfiber composite. The compositions of the present invention areparticularly suitable for use in various industrial or transportationapplications including automotive, light and heavy commercial vehicles,marine, or aerospace.

ASPECTS OF THE INVENTION

In the following, some non-limiting aspects of the present invention aresummarized:

Aspect 1. A composition, comprising:

-   -   an epoxy-containing component;    -   elastomeric particles in an amount of greater than 11% by weight        to 25% by weight based on total weight of the composition; and    -   a curing component activatable by an external energy source, the        curing component comprising at least one guanidine having a D90        particle size of 25 μm measured by dynamic light scattering.

Aspect 2. The composition of Aspect 1, wherein the elastomeric particlesare phase-separated from the epoxy-containing component.

Aspect 3. The composition of Aspect 1 or Aspect 2, wherein theepoxy-containing component comprises bisphenol A, bisphenol F, a novolacresin, or combinations thereof.

Aspect 4. The composition of any of the preceding Aspects, wherein theepoxy-containing component is present in an amount of 45% to 90% byweight based on total weight of the composition.

Aspect 5. The composition of any of the preceding Aspects, wherein theepoxy-containing component has an average epoxide functionality ofgreater than 1.0 and less than 3.2.

Aspect 6. The composition of any of the preceding Aspects, wherein theelastomeric particles have a core/shell structure.

Aspect 7. The composition of Aspect 6, wherein the elastomeric particlescomprise an acrylic shell and a butadiene core.

Aspect 8. The composition of Aspect 6 or Aspect 7, wherein the butadienecore comprises styrene-butadiene, polybutadiene, or combinationsthereof.

Aspect 9. The composition of any of the preceding Aspects, wherein atleast 50% by weight of the elastomeric particles comprise a styrenebutadiene core based on total weight of the elastomeric particles.

Aspect 10. The composition of any of the preceding Aspects, wherein atleast 50% of the elastomeric particles have an average particle size ofless than 150 nm as measured by transmission electron microscopy.

Aspect 11. The composition of any of the preceding Aspects, wherein nomore than 50% by weight of the elastomeric particles comprise apolybutadiene core and/or a polysiloxane core based on total weight ofthe elastomeric particles.

Aspect 12. The composition of any of the preceding Aspects, wherein lessthan 50% of the elastomeric particles have an average particle size ofgreater than 150 nm as measured by transmission electron microscopy.

Aspect 13. The composition of any of the preceding Aspects, wherein theat least one guanidine comprises dicyandiamide.

Aspect 14. The composition of any of the preceding Aspects, wherein theat least one guanidine is present in an amount of 2% to 20% based ontotal weight of the composition.

Aspect 15. The composition of any of the preceding Aspects, wherein theat least one guanidine comprises particles having a D90 particle size of20 μm.

Aspect 16. The composition of any of the preceding Aspects, furthercomprising fillers.

Aspect 17. The composition of Aspect 16, wherein the fillers are presentin an amount of no more than 20% by weight based on total weight of thecomposition.

Aspect 18. The composition of any of Aspects 1 to 15, wherein thecomposition is substantially free of platy fillers.

Aspect 19. The composition of any of the preceding Aspects, furthercomprising additives.

Aspect 20. The composition of Aspect 19, wherein the additives arepresent in an amount of no more than 20% by weight based on total weightof the composition.

Aspect 21. The composition of any of Aspects 1 to 18, wherein thecomposition is substantially free of additives.

Aspect 22. The composition of any of Aspects 1 to 18, wherein thecomposition is substantially free of free radical initiators.

Aspect 23. The composition of any of the preceding Aspects, furthercomprising a second curing agent.

Aspect 24. The composition of Aspect 23, wherein the second curing agentis a latent curing agent, a curing catalyst, or combinations thereof.

Aspect 25. The composition of any of the preceding Aspects, wherein thecomposition comprises a coating composition, an adhesive composition, ora sealant composition.

Aspect 26. A substrate comprising the coating composition of Aspect 25in an at least partially cured state.

Aspect 27. The substrate of Aspect 26, wherein at least one of thesurfaces of the substrate is 100% water break free.

Aspect 28. The substrate of Aspect 26, wherein at least one of thesurfaces of the substrate is non-water break free.

Aspect 29. The substrate of any of Aspects 26 to 28, wherein thesubstrate comprises a surface of a vehicle body, a component of avehicle frame, an assembly, or combinations thereof.

Aspect 30. The substrate of Aspect 29, wherein the vehicle comprises anautomobile, an aerospace vehicle, or a tank.

Aspect 31. The substrate of any of Aspects 26 to 28, wherein thesubstrate comprises a protective clothing.

Aspect 32. A part at least partially coated with the composition of anyof Aspects 1 to 24.

Aspect 33. An article, comprising:

a first substrate:

a second substrate; and

the composition of any of Aspects 1 to 24 positioned between the firstand second substrates.

Aspect 34. The substrate, part or article of any of Aspects 26 to 33,wherein the composition, in the at least partially cured state, has ahardness of greater than 100 N/mm² and an elongation of at least 40%.

Aspect 35. The substrate, part or article of any of Aspects 26 to 34,wherein the composition, in an at least partially cured state, has ashear stress of at least 33.0 MPa and a shear strain of at least 34.5%measured in accordance with ISO 11003-2.

Aspect 36. The substrate, part or article of any of Aspects 26 to 35,wherein the composition, in an at least partially cured state, has a lapshear strength of greater than 30.0 MPa, measured according to ASTMD1002-10 using 2024-T3 aluminum substrate of 1.6 mm thickness, asmeasured by an INSTRON 5567 machine in tensile mode with a pull rate of1.3 mm per minute, and a lap shear displacement at failure of at least15% of the overlap length.

Aspect 37. A method for forming a coating on a substrate surfacecomprising:

-   -   applying the composition of any of Aspects 1 to 24 to a surface        of a first substrate; and    -   applying an external energy source to at least partially cure        the composition.

Aspect 38. The method of Aspect 37, further comprising contacting asurface of a second substrate to the composition such that thecomposition is located between the first substrate and the secondsubstrate.

Illustrating the invention are the following examples that are not to beconsidered as limiting the invention to their details. All parts andpercentages in the examples, as well as throughout the specification,are by weight unless otherwise indicated.

EXAMPLES Example 1

Eight compositions were prepared from the mixture of ingredients shownin Table 1. All compositions were prepared at an amine-hydrogen to epoxyequivalence ratio of 1.4:1.0.

TABLE 1 Compositions I-VIII Components I II III IV V VI VII VIII Epon828¹ 100.00 — 24.40 — 23.84 — 33.20 — Epon 863² — 100.00 — 23.72 — — —32.80 Kane Ace MX-153³ — — 73.32 — — — — — Kane Ace MX-139⁴ — — — 74.60— — — — Fortegra 352⁵ — — — — 72.80 — — — Kane Ace MX-135⁶ — — — — —100.00 — — Kane Ace MX-257⁷ — — — — — — 66.80 — Kane Ace MX-267⁸ — — — —— — — 67.20 Dyhard 100S⁹ 16.36 17.32 12.02 13.38 12.33 13.39 12.06 13.01Total 116.36 117.32 109.74 111.70 108.97 113.39 112.06 113.01 Totalweight % core- 0% 0% 22% 22% 22% 22% 22% 22% shell rubber particles¹Liquid bisphenol A epoxy resin available from Hexion. ²Liquid bisphenolF epoxy resin available from Hexion. ³Blend of bisphenol A epoxy resinand ~100 nm diameter core-shell polybutadiene rubber available fromKaneka Corporation ⁴Blend of bisphenol F epoxy resin and ~100 nmdiameter core-shell polybutadiene rubber available from KanekaCorporation ⁵Blend of bisphenol A epoxy resin and ~100 nm diametercore-shell styrene-butadiene rubber available from Olin Epoxy ⁶Blend ofbisphenol F epoxy resin and ~100 nm diameter core-shellstyrene-butadiene rubber available from Kaneka Corporation ⁷Blend ofbisphenol A epoxy resin and ~200 nm diameter core-shell polybutadienerubber available from Kaneka Corporation ⁸Blend of bisphenol F epoxyresin and ~200 nm diameter core-shell polybutadiene rubber availablefrom Kaneka Corporation ⁹Dicyandiamide available from AlzChem (see sizeas measured in Example 2).

Compositions I through VIII above were used to prepare thick adherendshear specimens. The thick adherends were 2024-T3 aluminum alloymachined to the dimensions specified for stepped adherends in FIG. 1b ofISO 11003-2. The stepped end of each panel was grit blasted with 54-gritaluminum oxide media (available from Grainger®). The grit blasted areawas subsequently cleaned and deoxidized with ChemKleen 490MX (analkaline cleaning solution available from PPG Industries, Inc.,Cleveland, Ohio). Composition was applied to both adherends covering the25 mm×5 mm bond area. The adherends were then joined securely in amachined fixture to ensure alignment and uniform bond length of 5 mm andbond thickness of 0.6225 mm. Excess composition was cleaned from gapsand sides of stepped adherends and 1.5 mm thick polytetrafluoroethylenestrips were inserted into the gaps to maintain a well-defined bondlength. The fixture containing the thick adherend lap joints was thenbaked at 170° C. for 3.5 hours.

Baked thick adherend lap shear specimens were loaded onto an INSTRON5567 machine and a D5656 averaging extensometer from Epsilon TechnologyCorporation with a pin separation distance of 4 mm was placed around thebondline as specified in ISO 11003-2. Specimens were pulled at a rate of0.5 mm per minute. Table 2 reports the measured values and thosecalculated based on the equations given in ISO 11003-2, using 28 GPa asthe shear modulus of the adherents (MatWeb, LLC), with the strain energydensity being the area under the stress-strain curve (FIG. 1).

Lap shear specimens were prepared with compositions I through VIII aboveaccording to ASTM D1002-10. The substrate used was 2024-T3 aluminumalloy panels measuring 25.4 mm×101.6 mm×1.6 mm. One end of each panel,including the entire width (25.4 mm) and at least 25.4 mm from one end,was grit blasted with 54-grit aluminum oxide media (available fromGrainger®). The grit blasted area was subsequently cleaned anddeoxidized with ChemKleen 490MX (an alkaline cleaning solution availablefrom PPG Industries, Inc., Cleveland, Ohio). Composition was applied toone end of a panel covering the full 25.4 mm width and ≥12.7 mm from oneend. Glass beads averaging 0.25 mm in diameter were mixed into thecomposition in an amount of 2% by weight based on total weight of thecomposition. A second grit blasted and cleaned aluminum panel was thenplaced over the composition layer in an end-to-end fashion, resulting ina bond area of 25.4 mm×12.7 mm. Lap joints were secured with metal clipsand excess composition cleaned, leaving a 45° fillet. Lap joints werebaked at 90° C. for 60 minutes, then the temperature was ramped to 160°C. at 1° C. per minute, and finally held at 160° C. for 90 minutes. Thebaked lap joint specimens were tested using an INSTRON 5567 machine intensile mode with 25.4 mm of aluminum substrate in each grip and at apull rate of 1.3 mm per minute (in accordance with ASTM D1002-10).

TABLE 2 Shear Properties and Lap Joint Performance of Compositions Ithrough VIII. Composition I II III IV V VI VII VIII Shear Properties d(measured 0.06 ± 0.02 0.07 ± 0.02  0.22 ± 0.03  0.24 ± 0.03  0.26 ± 0.04 0.47 ± 0.04 0.21 ± 0.01 0.21 ± 0.03 displacement, mm) τ (max shear 37.2± 6.2  36.3 ± 2.1  33.7 ± 2.2 35.0 ± 0.5 37.9 ± 0.3 40.2 ± 0.4 34.5 ±4.4  28.4 ± 3.1  stress, MPa) γ (shear strain 9.0 ± 3.4 11.2 ± 3.6  35.0± 4.9 38.3 ± 5.0 40.6 ± 7.0 74.6 ± 6.6 33.3 ± 1.1  33.0 ± 4.1  atfailure, %) G (shear 808 ± 95  781 ± 179 466 ± 86 419 ± 33  679 ± 111747 ± 45 635 ± 122 587 ± 202 modulus, MPa) Strain Energy 2.3 ± 1.3 2.9 ±1.2 10.2 ± 2.3 11.6 ± 1.9 13.5 ± 2.5 26.6 ± 2.3 9.6 ± 0.9 8.1 ± 1.0Density (MPa) Lap Joint Performance Lap Shear 20.3 ± 2.4  22.4 ± 1.2 32.2 ± 5.7 35.6 ± 2.2 36.2 ± 1.3 42.2 ± 2.3 31.8 ± 1.3  33.1 ± 3.2 Strength (MPa) Displacement at 1.1 ± 0.2 1.2 ± 0.1  2.0 ± 0.5  2.3 ± 0.2 2.3 ± 0.1  3.6 ± 0.7 2.0 ± 0.1 2.1 ± 0.2 Failure (mm)

The data from Example 1 demonstrate that inclusion of styrene butadieneparticles having an average particle size of less than 100 nm resultedin an adhesive having improved shear properties (a maximum shear stressof at least 33.0 MPa and a shear strain of at least 34.5%) and/orimproved lap shear strength (at least 30.0 MPa) and improved lap sheardisplacement at failure (at least 15% of the overlap, in this Example,1.905 mm).

Example 2

Example 2 (compositions IX to XIII) illustrates the effects of guanidineparticle size and the effects of elastomeric particle concentration. Theparticle size of the guanidine were measured in their dry state, priorto mixing into the composition, using a LS 13 320 Laser DiffractionParticle Size Analyzer available from Beckman Coulter. Measurements wereperformed in triplicate using at least 3 grams of material and underambient conditions. Dyhard 100 and Dyhard 100S were measured to have D90particle sizes of 20 μm and 10 μm, respectively. Lap joints wereprepared and tested in accordance with ASTM D1002-10, as describedabove.

TABLE 3 Compositions IX to XIII Components IX X XI XII XIII Kane AceMX-135 18.18 18.18 16.00 12.81 8.82 Epon 863 — — 2.18 5.36 9.36 Dyhard100³ 1.82 — — — — Dyhard 100S³ — 1.82 1.82 1.82 1.82 Total 20.00 20.0020.00 20.00 20.00 Total weight % core-shell 23% 23% 20% 16% 11% rubberparticles D90 guanidine particle size 20 10 10 10 10 (μm) Lap JointPerformance Max Strength (MPa) 40.6 ± 1.1  45.3 ± 2.5  41.0 ± 2.2  39.8± 5.3  24.2 ± 1.5  Displacement at failure 2.69 ± 0.34 5.05 ± 1.24 3.23± 0.59 3.27 ± 1.34 1.55 ± 0.10 (mm)

The data from Example 2 illustrate that inclusion of a guanidine havinga D90 particle size of less than 25 μm improves both the strength anddisplacement of the adhesive. The data also demonstrate that inclusionof greater than 11% by weight of elastomeric particles based on totalweight of the composition improves strength and displacement of theadhesive.

Example 3

Example 3 illustrates the effect of the addition of mica to thecomposition. Lap joints were prepared, cured, and tested in accordancewith ASTM D1002-10, as described above.

TABLE 4 Compositions XIV and XV Components XIV XV Kane Ace MX-135 22.0422.04 Dyhard 100S 2.96 2.96 Mica¹ — 1.31 Total 25.00 26.31 Lap JointPerformance Max Strength (MPa) 44.0 ± 1.5  35.4 ± 0.9  Displacement atfailure (mm) 4.35 ± 0.80 2.26 ± 0.05 ¹DakotaPURE ™ 3000 available fromPacer Corp.

The data from Example 3 illustrate that the inclusion of mica in thecomposition reduces both lap shear strength and displacement of theadhesive.

Example 4

Compositions XVI to XXI were prepared as described in Example 1 and asshown in Table 5, but were prepared at an amine-hydrogen to epoxyequivalence ratio of 1.1:1.0. Lap joints were prepared, cured, andtested as described in Example 1.

TABLE 5 Compositions XVI to XXI Components XVI XVII XVIII XIX XX XXIEpon 828¹ 25.00 — — — — — Epon 863² — 25.00 — — — — Epon 162³ — — 25.0012.50 — — D.E.N. 431 Epoxy — — — 12.50 25.00 12.50 Novolac⁴ D.E.N. 439Epoxy — — — — — 12.50 Novolac⁵ Paraloid EXL- 8.20 8.30 8.28 8.28 8.278.21 2650J⁶ Dyhard 100S⁷ 3.13 3.46 3.38 3.37 3.36 3.15 Aerosil R 202⁸1.12 1.14 1.13 1.13 1.13 1.13 Total 37.45 37.90 37.79 37.78 37.76 37.49Total Weight % 22% 22% 22% 22% 22% 22% Core-Shell Average Epoxide 2.02.0 2.2 2.5 2.8 3.2 Functionality (Resin) Lap Joint Performance MaxStrength 40.6 ± 1.5  43.0 ± 1.3  42.8 ± 0.4  40.2 ± 1.1  36.9 ± 3.1 25.6 ± 4.0  (MPa) Displacement at 3.45 ± 0.32 4.12 ± 0.42 3.77 ± 0.192.96 ± 0.37 2.52 ± 0.46 1.46 ± 0.25 Failure (mm) ¹Bisphenol A epoxyresin from Hexion, difunctional epoxy according to supplier technicaldata sheet (therefore average epoxide functionality assumed to be 2.0).²Bisphenol F epoxy resin from Hexion, difunctional epoxy according tosupplier technical data sheet (therefore average epoxide functionalityassumed to be 2.0). ³Bisphenol F epoxy novolac resin from Dow Chemical,average epoxide functionality = 2.2 ⁴Bisphenol F epoxy novolac resinfrom Dow Chemical, average epoxide functionality = 2.8 ⁵Bisphenol Fepoxy novolac resin from Dow Chemical, average epoxide functionality =3.8 ⁶Core-shell styrene-butadiene rubber particles available from DowChemical ⁷Dicyandiamide available from AlzChem ⁸Hydrophobic firmedsilica available from Evonik

The data from Example 4 illustrate that lap shear strength anddisplacement of the adhesive are reduced when the average epoxidefunctionality of the epoxy-containing component is greater than 3.2.

Example 5

Two compositions were prepared from the mixture of ingredients shown inTable 6. All compositions were prepared at equal weight % dicyandiamidebased on total composition weight. Lap joints were prepared, cured, andtested as described in Example 1.

TABLE 6 Compositions XXII and XXIII Components XXII XXIII Kane AceMX-135 25.00 25.00 Epon 863 1.82 — Flexibilizer DY965¹ 5.47 7.29 Dyhard100S 3.43 3.43 Total 35.72 35.72 Weight % Core-Shell 18% 18% RubberWeight % DY965 15% 20% Lap Joint Performance Max Strength (MPa) 39.2 ±0.8  33.4 ± 1.5  Displacement at Failure 2.65 ± 0.12 2.09 ± 0.08 (mm)¹Phenol-capped urethane flexibilizer available from Huntsman

The data from Example 6 illustrate that inclusion of a flexibilizer inthe composition does not improve lap shear strength and displacement ofthe adhesive (c.f., strength and displacement of Composition XII,above).

Example 6

Lap joint specimens were prepared with Scotch-Weld™ Epoxy AdhesiveEC-1386 and with composition XIV (Example 3, above) under the optimumconditions specified in the technical data sheet for EC-1386, asfollows. All 2024-T3 aluminum substrate (1.6 mm thick) was preparedusing an alkaline degrease and an acid etch. Lap joint specimens wereprepared according to ASTM D1002-10. In order to maintain a bondlinethickness within the specified optimal performance range for EC-1386 (2to 5 mil), 3 mil glass beads were added to each composition at 2% byweight based on total weight of the composition. Lap joint specimenswere baked at 177° C. for 90 minutes, the recommended cure cycle toobtain optimum bond properties of EC-1386. Testing was conductedaccording to ASTM D1002-10.

TABLE 7 Lap Joint Performance Scotch-Weld ™ Composition EC-1386¹ XIV MaxStrength (MPa) 27.6 ± 0.6  47.7 ± 0.5  Displacement at failure (mm) 1.88± 0.11 6.58 ± 0.10 ¹Commercial one-component epoxy composition availablefrom 3M and containing 10-20 wt % elastomeric phase and 5-10 wt %dicyandiamide; average diameter of elastomeric phase in curedcomposition measured to be 508 ± 50 nm from TEM of microtomecross-sections.

The data from Example 6 illustrate the importance of including in theadhesive composition at least 50% of elastomeric particles having anaverage particle size of less than 150 nm as measured by TEM.

Example 7

Compositions I to VII were used to prepare thermosetting coatings onsteel and aluminum. Coatings were prepared using a 0.10 mm draw down baron acetone-cleaned metal substrate and were baked at 90° C. for 60minutes, followed by a ramp to 160° C. at 1° C. per minute, and finallyheld at 160° C. for 90 minutes. Coatings prepared on cold rolled steel(0.81 mm thick) were tested for hardness using a Fischerscope HM2000S ata rate of 100 mN/10s. Coatings prepared on TO-2024 aluminum (0.81 mmthick) were used for reverse impact elongation testing according to ASTMD6905 with a Gardco GE Universal Impact Tester IM-172-GE/1. Results arecompiled in Table 8 and are an average of at least three measurements.

TABLE 8 Coating Hardness and Impact Elongation of Compositions I to VIIComposition I II III IV V VI VII Hardness 177 ± 3 222 ± 3 104 ± 2 131 ±18 101 ± 1 122 ± 1 85 ± 2  (N/mm²) Impact  13 ± 4  10 ± 0  48 ± 10 >60 48 ± 10 >60 26 ± 12 Elongation (%)¹

The data from Example 7 demonstrate that inclusion of styrene butadieneparticles having a particle size of less than 100 nm resulted in acoating having a hardness of greater than 100 N/mm² and a reverse impactelongation of at least 40%.

1. A composition, comprising: an epoxy-containing component; elastomericparticles in an amount of greater than 11% by weight to 25% by weightbased on total weight of the composition; and a curing componentactivatable by an external energy source, the curing componentcomprising at least one guanidine having a D90 particle size of 25 μmmeasured by dynamic light scattering.
 2. The composition of claim 1,wherein the elastomeric particles are phase-separated from theepoxy-containing component.
 3. The composition of claim 1, wherein theepoxy-containing component comprises bisphenol A polyepoxide, bisphenolF polyepoxide, a novolac resin, or combinations thereof.
 4. Thecomposition of claim 1, wherein the epoxy-containing component ispresent in an amount of 45% to 90% by weight based on total weight ofthe composition.
 5. The composition of claim 1, wherein theepoxy-containing component has an average epoxide functionality ofgreater than 1.0 and less than 3.2.
 6. The composition of claim 1,wherein at least 50% by weight of the elastomeric particles comprise astyrene butadiene core based on total weight of the elastomericparticles, at least 50% of the elastomeric particles have an averageparticle size of less than 150 nm as measured by transmission electronmicroscopy, and/or wherein no more than 50% by weight of the elastomericparticles comprise a polybutadiene core and/or a polysiloxane core basedon total weight of the elastomeric particles. 7-8. (canceled)
 9. Thecomposition of claim 1, wherein the at least one guanidine comprisesdicyandiamide.
 10. The composition of claim 1, wherein the at least oneguanidine is present in an amount of 2% to 20% based on total weight ofthe composition.
 11. The composition of claim 1, further comprisingfillers in an amount of no more than 20% by weight based on total weightof the composition and/or additives in an amount of no more than 20% byweight based on total weight of the composition.
 12. (canceled)
 13. Thecomposition of claim 1, wherein the composition is substantially free ofadditives, platy fillers, and/or free radical initiators.
 14. (canceled)15. The composition of claim 1, further comprising a second curing agentcomprising a latent curing catalyst, an active curing catalyst, orcombinations thereof.
 16. (canceled)
 17. The composition of claim 1,wherein the composition comprises a coating composition, an adhesivecomposition, or a sealant composition.
 18. A coated substrate, whereinat least one surface of the substrate is at least partially coated withthe composition of claim
 1. 19. The coated substrate of claim 18,wherein at least one of the surfaces of the coated substrate is 100%water break free.
 20. The coated substrate of claim 18, wherein at leastone of the surfaces of the coated substrate non-water break free. 21.The coated substrate of claim 18, wherein the composition, in an atleast partially cured state, has a hardness of greater than 100 N/mm²and an elongation of at least 40%.
 22. The coated substrate of claim 19,wherein the substrate comprises a protective clothing.
 23. A part atleast partially coated with the composition of claim
 1. 24. An article,comprising: a first substrate: a second substrate; and the compositionof claim 1 positioned between the first and second substrates.
 25. Thearticle of claim 24, wherein the composition, in an at least partiallycured state, has a bulk shear stress of at least 33.0 MPa measured inaccordance with ISO 11003-2, a bulk shear strain of at least 34.5%measured in accordance with ISO 11003-2, a lap shear strength of greaterthan 30.0 MPa, measured according to ASTM D1002-10 using 2024-T3aluminum substrate of 1.6 mm thickness, as measured by an INSTRON 5567machine in tensile mode with a pull rate of 1.3 mm per minute, and a lapshear displacement at failure of at least 15% of the overlap length. 26.(canceled)
 27. A method for forming a coating on a substrate surfacecomprising: applying the composition of claim 1 to a surface of a firstsubstrate; and applying an external energy source to at least partiallycure the composition.
 28. The method of claim 27, further comprisingcontacting a surface of a second substrate to the composition such thatthe composition is located between the first substrate and the secondsubstrate.